SSRF in N8n-Io N8n
CVE-2026-118679
n8n before 1.123.83, 2.41.4, and 2.42.1 contains a server-side request forgery vulnerability in the Slack Trigger webhook that allows unauthenticated attackers to exfiltrate Slack tokens by bypassing signature verification when no signing secret is set. Attackers who know the webhook URL can name a file to download, causing the node to send the workspace access token to an attacker host and return the response.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-3c3p-5959-3ghr (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.83-2.41.4-and-2.42.1-slack-token-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118679?
- CVE-2026-118679 is a high-severity vulnerability in N8n-Io N8n, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-10-28.
- How severe is CVE-2026-118679?
- High severity. CVSS v3 base score is 7.5 out of 10.